WebDev/VersaWhiteboard
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Merge pull request #36 from jb-leger/undo_in_server_part

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undo buffer also in server part for redo
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Cracker 2020-04-18 19:05:23 +02:00 committed by GitHub
commit 0debc482f4
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2 changed files with 29 additions and 1 deletions
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2
README.md
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@ -43,7 +43,7 @@ Result | Windows and Linux | macOS
------ | -------------------- | -------
Clear the whiteboard | Ctrl + Shift + Z | Command + Shift + Z
Undo your last step | Ctrl + Z | Command + Z
Redo your last undo | Ctrl + Shift + Z | Command + + Shift + Z
Redo your last undo | Ctrl + Shift + Z | Command + Shift + Z
Select an area | Ctrl + X | Command + X
Take the mouse | Ctrl + M | Command + M
Take the pen | Ctrl + P | Command + P

28
s_whiteboard.js
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@ -1,6 +1,7 @@
//This file is only for saving the whiteboard. (Not to a file, only to RAM atm. Whiteboard is gone after server restart)
var savedBoards = {};
var savedUndos = {};
module.exports = {
handleEventsAndData: function (content) {
var tool = content["t"]; //Tool witch is used
@ -8,19 +9,46 @@ module.exports = {
var username = content["username"];
if (tool === "clear") { //Clear the whiteboard
delete savedBoards[wid];
delete savedUndos[wid];
} else if (tool === "undo") { //Undo an action
if (!savedUndos[wid]) {
savedUndos[wid] = [];
}
if (savedBoards[wid]) {
for (var i = savedBoards[wid].length - 1; i >= 0; i--) {
if (savedBoards[wid][i]["username"] == username) {
var drawId = savedBoards[wid][i]["drawId"];
for (var i = savedBoards[wid].length - 1; i >= 0; i--) {
if (savedBoards[wid][i]["drawId"] == drawId && savedBoards[wid][i]["username"] == username) {
savedUndos[wid].push(savedBoards[wid][i]);
savedBoards[wid].splice(i, 1);
}
}
break;
}
}
if(savedUndos[wid].length > 1000) {
savedUndos[wid].splice(0, savedUndos[wid].length - 1000);
}
}
} else if (tool === "redo") {
if (!savedUndos[wid]) {
savedUndos[wid] = [];
}
if (!savedBoards[wid]) {
savedBoards[wid] = [];
}
for (var i = savedUndos[wid].length - 1; i >= 0; i--) {
if (savedUndos[wid][i]["username"] == username) {
var drawId = savedUndos[wid][i]["drawId"];
for (var i = savedUndos[wid].length - 1; i >= 0; i--) {
if (savedUndos[wid][i]["drawId"] == drawId && savedUndos[wid][i]["username"] == username) {
savedBoards[wid].push(savedUndos[wid][i]);
savedUndos[wid].splice(i, 1);
}
}
break;
}
}
} else if (["line", "pen", "rect", "circle", "eraser", "addImgBG", "recSelect", "eraseRec", "addTextBox", "setTextboxText", "removeTextbox", "setTextboxPosition", "setTextboxFontSize", "setTextboxFontColor"].includes(tool)) { //Save all this actions
if (!savedBoards[wid]) {